Absorption-to-Scattering Ratio, A/S

What is absorption-to-scattering ratio, A/S?

(absorption-to-scattering ratio, A/S in French: coefficient d’absorption et de diffusion, K/S basic equation developed in the 2-component theory of Kubelka and Munk in 1931 for the mixture of opaque color layers; ratio of A (concentration-dependent absorption degree of the color layer) to S (scatter behavior of the color layer, depending on the reflection degree R), calculated across the entire visible spectrum: For the Kubelka-Munk equation to be used for the development of recipes for transparent inks as well, there must be sufficiently thick color layers of the components to be mixed so that a spectrophotometric measurement can be carried out without any influence being exercised by the substrate. Color mixing and developing software using refining algorithms determine the concentrations c of the basic inks to be mixed, and any other remaining inks to be used.